Dynamic matrix control of steam temperature preventing saturated steam entering a superheater

摘要

A technique of controlling a steam generating boiler system preventing saturated steam from entering a superheater section uses a rate of change of a disturbance variable 210 and modifies the control signal based on a saturated steam temperature and an intermediate steam temperature (126A, fig 1). The controller 222 can be of the dynamic matrix type. A current output steam temperature 202 and an output steam setpoint 203 can also be used to generate a control signal. In some embodiments, the control signal is modified based on a threshold and/or an adjustable function g(x), and can have a fuzzifier. The modified control signal is used to control a field device (e.g. valve 122, fig 1) that affects the intermediate steam and output steam of the boiler system. A prevention block (e.g. 282, fig 5D) can be included in a dynamic matrix control block.